I would recommend LauncherPro Plus. That takes care of Facebook, twitter, calendar, bookmarks, people, and messaging. They look awesome and there isn't another Facebook widget anywhere near as good as LP+. Plus it is the best launcher on Android.

Other than that I use Beautiful widgets for clock, date, current weather.

i purchased the peoples widget but i dont know where to find the unlock code???? can someone help me out please??!!!

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when you purchase LP+ the dev sends you an email with your unlock code. As far as widgets...i use the LP+ widgets but also Beautiful Widgets and the "Pure" widgets. The best way to find out what you like is to just install a bunch and play around with them.